Collet chuck



April 1949- A. M. STONER 2,466,129

COLLET CHUCK Filed Oct. 17, 1945 3 Sheets-Sheet l Fie. 1.

6| 6 F316 4. flake"? I! 3| INVENTOR. j

ARTHUR MERRlCK STONER. 52 52. BY

5%MJZ ATTQRN EY.

P 1949- A. M. STONER 2,466,129

COLLET CHUCK 3 Sheets-Sheet 2 Filed Oct. 1'7, 1945 FIG. 10

2l-A U W INVENTOR. ARTHUR MERRlCK STONER.

13 H12 ATTORNEY- A ril 5, 1949.

Patented Apr. 5, 1949 COLLET CHUCK Arthur Merrick Stoner, West Hartford, Conn,

assignor to The Jacobs Manufacturing Company, Hartford, Conn., a corporation of Connecticut Application October 1'7, 1945, Serial No. 622,890

4 Claims.

My invention relates to an improved collet chuck which is especially well adapted for holding valves while they are being resurfaced, although it is not limited to that particular use. Tappet valves often are constructed with integral tappet heads and collets for holding them must have a sufficiently large range of adjustment to permit the passage of such heads and to grip the valve stems which are of much smaller diameters.

An object of the present invention is to provide an inexpensive collet chuck which has a large range of adjustment and which is able to centralize a desired article with great nicety.

I will describe the invention in the following specification and point out its novel features in claims.

Referring to the drawings:

Fig. 1 is a sectional side elevation of a chuck which is made according to and embodies the invention, mounted in a pedestal and engaging the stem of a valve.

Fig. 2 is a front elevation and Fig. 3 a rear view of the chuck shown in Fig. 1.

Fig. 4 is a sectional side elevation of parts of the chuck shown in the preceding figures in their open positions. This figure also shows a valve stem with an integral tappet head on its end.

Fig. 5 is an end elevation on a larger scale of the collet shown in Figs. 1, 2 and 4.

Fig. 6 is a sectional end elevation of the collet, the section being taken on the line 6-6 of Fig. 4.

Fig. 7 is a view similar to Fig. 6 with the gripping members in their closed positions. A part of the body of the chuck is also shown in this figure.

Fig. 8 is a sectional side elevation of a gripping member of modified form and of a part of the resilient body which connects it with other gripping members.

Fig. 9 is a sectional end elevation of the parts shown in Fig. 8, the section being taken on the line 9-9 of the latter figure.

Fig. 10 is a sectional side elevation of amodified structure which also embodies this invention.

Fig. 11 is a sectional end elevation of the device shown in Fig. 10. The section in this view is taken on the line ll-l l of Fig. 10 with the gripping members omitted.

Fig. 12 is a sectional end elevation taken on the line l2l2 of Fig. 10.

Fig. 13 is a sectional end elevation taken on the line |3I3 of Fig. 10 but with the gripping members in their closed positions in which they are shown by dash and dot lines in Fig. 10.

Fig. 14 is a sectional side elevation of a part of a chuck and illustrates another structural modification.

In Figs. 1-7, 20 designates the body of the chuck. This is a tubular member having an internal conical cam surface 2| at its forward end and internally threaded bore 22 at its rear end. 23 is a smooth internal cylindrical surface in the body between which and the cam surface 2| is a part 24 of enlarged internal diameter.

30 is a tubular pressure member having an internal conical cam surface 3| at its left hand end, as shown in the drawings and an internal bore 32. A part of this pressure member has an outer surface 33 which is in longitudinally slidable engagement with the surface 23 of the body. If desired, the body and the pressure member may be splined together to prevent relative rotation between them. 34 is an extension of the pressure member of smaller diameter. In it is an annular ball race 35. p I

40 is an adjusting collar having a bore 4| rotatively mounted on the extension 34 of the pressure member. Its inner end is provided with external screw threads 42 which engage the threads 22 in the body. 43 is .a. ball race in the adjusting collar in alinement with the ball race 35 and 44 designates a series of balls in these ball races which serve to interconnect the adjusting collar and the pressure member to cause them to move together longitudinally. 45 is an integral flange which extends outwardly from the pressure member beyond the end of the body 20. In it is a radial threaded hole 46 through which the balls 44 can be introduced into the ball races. This hole is closed by a threaded plug 41. Angularly spaced radial spanner wrench holes 48 are provided in the periphery of the flange.

The collet, designated generally by the reference numeral 50, comprises a plurality of radially disposed angularly spaced rigid gripping members 5|. In the specific forms shown in the drawings there are three of these gripping members each of which has fiat parallel sides.

1-7 each gripping member has ends 52, the outer surfaces of which are beveled to'fit'the cam" In Figs. 1

surfaces 2|, 3| and their inner surfaces 54 form straight aligned gripping edges parallel to the axis of the cam surfaces. 55 is an integral intermediate portion which in the form shown is of reduced cross-sectional radial dimension, which 5 interconnects the ends 52.

60 is a body of resilient material which surrounds the reduced portions of each of the gripping members between the heads thereof so that these intermediate portions 55 are embedded in the body. This serves to hold the gripping members in desired-.re1ative.positions... This...body ispreferably affixed fzto ithe parts"v of? the: grippingg members which it surrounds, as for example, by being vulcanized to them. If desired, the pore tions 55 of the gripping members may be perforated, in which case parts of the resilient Lb'odgtr. pass through them as shown at 6| Before specifically describin'gjth'e modifications: shown in the remaining figures ofcthenrawln s, I will point out the operation of the arrangement shown in Figs. 1-7. When the collet is open, as shown in Fig. 4, the gripping edges '54' aresuifi'-- ciently far apart to permit the insertion of.-a. valve stem 10 with an enlarged integral tappet head H on its end. Then by rotating the adjusting co1'lar'40'; the pressure. member 30. is forcediin- Wardly to .bring the cam surfaces 2| 3| nearer" together. This, by reason of the engagement "of the beveledsurfaces 53 of the heads 52 .With the cam surfaces, movesthe grippingmemb'ers toward "and into engagement with the "valvejstem;

10 and the latter is .engaged at longitudinally" spaced'parts thereof. During thisoperationthe. parts'of -the.body. between adjacent gripping- 5 members will be forced outwardly, as shownrat' SDAiinIFig; 7 and .in dotted linesimFig. 2"int01. the space provided by. the internally enlarged 1 part of "the body. Its inner edges WilI.'.fOld" outwardly'as shown at 60B. The valve 72 is accu- 9, rately.:'centered and. can .be ground or resurfaced bysuitable equipment.

To enable this resurfacing tobe done, the body 20'.'of the'ch'uck, is mountediina sleeve 21'which' is rotatively supported'in a pedestal 28. A" gear His provided near an end of the sleeve by means, of *whichpit 'andthe chuck may be rotated.

The gripping member 5|A shown in- Figs. 8f an'd'9iis similar. to that previously described; but in this case the gripping edge 54A'is a continuous straightedge and .the resilientbody 60Asurrounds three sides instead of. four of the, intermediate part A;

In'themodification illustrated in Figs. 1 1043', V the, body 2 OAis .constructed with longitudinally. spacedlcam surfaces .2 IA 7 and '2 IB of. ,iunlike size, I both. bevelled in the same direction. The ens. largedjhead 52 is similarto that'previously describedbut the head,52A"i s larger. The gripping edges. 54. are parallel and .in. mutual alignment. The rear .end 56 ofthe head 52A1is in.a straight; line normahto. the .axis of/the. chuck. The. resilient body surrounds. intermediatev portions... 55fbetween the enlargedheads.v as. in the con:' I struction beforedescribed.

In this .case thegrippingaction is. effectedbm a longitudinal movementoftthe. collet.. Thisjis. producedlby moving. a. pressure member 301%. againstthe collet. Thispressure memberghasna... transverseend 3 IA which abuts. the .rear.. ends c. 56 of -the gripping .members. and may be-radially slotted-as shown at, 5.1. to:v receive them.and to. prevent-relative rotation between .the-:- pressune. member-and:thegrippingmembers;. Relativ froe tation between the.-.pressure,\member-z3OA andgthee 1 4 body 20A is prevented by a key 58 in the pressure member and in a longitudinal slot 59 in the body 20A. 40A is an adjusting collar in threaded engagement with the body 20A.

When the gripping members are thus held against rotating in relation to the body, the conical cam surface 2 IA is cut back longitudinally between adjacent gripping members as shown at NC in Figs. 10, 12 and 13 to provide clearance spaces for the extended parts 60A of the resilient body.

Irnthe construction shown..in,.E!ig. 14 there is'aj-SiIIgIe-cam surfaceaZJD'iformed inqthe body 203. This cam surface is continuous except for an; annular pocket 2IE cut in it to receive the expanded part 60A of the resilient body. The h'eads'252C of the gripping members are larger thaninthe former. cases and their beveled surfaees.53A;.are .in..alinement with the surfaces 53 of. th'eaheads; 52: 3. The operation of this device is obviously similaznto that of the device shown in Fig. 10.

Various modifications in construction, mode of operation, method and use of an invention may and do occur to others, especially after benefitting from knowledge of such a disclosure .as that herein presentedofjthe principles involved, but theinventionitself is 'not'confined-to the present showin v 11. A collet comprising CIOSSrSBCtiQI-lfil ,1 dimension, and a. circumferentially continuousbody ofresilient material abuttingthesides ofthe gripping members .--passing, through the, perforations therein andraround.

said'intermediate smaller portions thereof.

2. A collet comprising a pluralitypf. .angularly spaced rigid gripping, members.radially..disposed aboutan .axis andjparallel .with said axis, ,said

grippingmembers,sbeingv providedwith transverse I perforations and having sides. and. enlarged.

tapered ends and intermediate ortions of smaller cross-sectional dimension. and.;.a.. circumferene tiallyicontinuous bod-y of resilientmaterialabutting..'th'e sides. of. the... gripping ,members. passing throughthe. perforations. therein and; around, ..intermediate smaller. p0r.-

and surrounding -said tions. thereof."

3. A chuck havinga pair.of-camshavingz-coni 55;; cal. surfaces, at .least. one of g thecams being, re-

cessedeto .form spaces 'inits conical cam surface; combined; with a collet comprising. a plurality of. angularly. Spacedrigid: gripping... members. radially disposed. about the axis of -the--camsurmfaces and parallel with said axis, said gripping;

members. having: enlarged. ends;- with inclined outer surfaces. adaptedr to be engaged by. said, cam. surfaces": and. intermediate; portions; of: smaller cross-sectional dimension, a-.circumfer.-

ential-ly -continuous body-of resilient-material-between-the;gripping members passing:aroundtlrie intermediate smaller portions of. said members;

means-.yfor. preventing; relative rotation between the camesurfacesa and: the collet. and -means .-.-fo r= impanting.; relative1- longitudinal;- movement be tweensthe cam surfaces. and the" collet:

4.; .A chucke having; n pair: of longitudinally; spaced cams having surfaces -.inolined;synunetrie cally to. a .commo nsaxis at;least on.ee0f t ee" an-IS.

being recessed to form spacesgin..itszinclinedisune' a plurality. of angularly spacedrigid gripping members radially disposed about ,an axisand .parallel with said. axis said gripping members being. provided with transverse perforations and. having sides andenlarged; taperedendsandintermediate portions .of smaller.

faces, and a collet comprising a plurality of similarly spaced rigid gripping members radially disposed about the same axis and parallel with said axis, said gripping members having enlarged ends with inclined outer surfaces arranged to be engaged by said cam surfaces and intermediate portions of smaller cross-sectional dimension, a circumferentially continuous body of resilient material between the gripping members and passing around the smaller intermediate portions of said members, means for preventing relative rotation between the cam surface and the collet, and means for imparting relative longitudinal movement between the cam surfaces and the collet.

ARTHUR MERRICK STONER.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS 

